The SeattleWA subreddit is pretty angry. That community expresses a lot of stereotypical 'I vote republican values'.
I prefer the Seattle reddit but don't much like either. The Seattle subreddit can have too much holier than thou sniping for points for my taste. Its the kind of place where if you expressed some doubt about this 'defund the police' thing you've heard about you might get some thoughtful responses and you might also get a breathless history lesson that accuses you of supporting chattel slavery. The SeattleWA subreddit is too full of violence for me - many posts are about violent crime, conversations about street people frequently have people fantasizing about using violence to resolve the issue. Its the kind of place where a post asking what post-covid seattle is like mostly has people expressing contempt for masking policies in the abstract and deriding people they have seen wearing a mask, a few folk addressing the question, and one person who has been around long enough to compare it to the recession in the 80's (which I thought was neat enough to mention).
I don't know of a third, but those two are different enough that I think even a casual inspection of both will give you an idea of which you might prefer.
